JP5953133B2 - Chamfering machine - Google Patents

Description

  The present invention relates to a cutter table, a cutter blade for chamfering, and a chamfering machine, which are used for chamfering a peripheral edge of a plate-like body or a peripheral edge of an opening such as a groove or a hole formed in the plate-like body. It is about.

  Conventionally, a hand-type chamfering machine used in chamfering processing is configured by mounting a chamfering cutter blade, which has a cutter tip attached to a cutter table, to the tip of an output shaft that is driven to rotate by electricity or compressed air. ing. Then, the operator holds the chamfering machine and rotates the cutter blade when chamfering, and presses the cutting blade provided at the tip of the cutter tip against the target to cut the target location. Chamfer.

As a thing regarding the apparatus and member which concern on the said chamfering process, the thing of a structure as disclosed by patent document 1 or patent document 2 is proposed.
Patent Document 1 is a configuration in which a throwaway tip for a chamfering cutter having a rhombus-shaped tip body is attached and fixed to a tip mounting seat formed at the tip of the cutter body that is rotated around an axis. Patent Document 2 discloses a circular main body, a plurality of arc-shaped cutting blades arranged at predetermined intervals on the peripheral edge of the main body, and a rear side of the cutting direction of the cutting blade. An insert tip having a first inclined surface that secures a margin angle is used, and a rotation shaft that is rotated by a driving means and two or more mounting grooves in which the insert tip is installed are formed, and the rotation shaft A chamfering machine including a holder to be assembled is configured.

JP 2005-28502 A JP 2009-172761 A

However, in the chamfering machine, by inserting a screw into a hole formed in the cutter tip and screwing the screw into a screw hole formed in the cutter table, the cutter chip is inserted into the cutter table with the screw. While tightening and fixing, when the cutting blade is worn, etc., it is configured to be replaceable by detaching the cutter tip from the cutter base by loosening the screw, etc., but in this configuration, due to vibration during cutting, etc. There was a problem that the screw was easily loosened.
That is, in order to prevent the processing efficiency from being impaired, the cutter base has a relief (gap) formed around the cutter tip so that the cutter tip can be reused multiple times. As a result, the cutter tip is loosely fixed, and the cutter tip vibrates finely due to vibration or impact during cutting, so that the screw is easily loosened. In particular, in a hand-type chamfering machine that an operator holds in his / her hand, it may be used in an environment where it is tilted at various angles or vibrations occur irregularly. The above problems become significant.

In addition, a polygonal stopper is formed on the back surface of the cutter tip with the surface on which the cutting blade is formed as the front surface, and then a recess is formed on the cutter base to engage the stopper, or the hole through which the screw is inserted is eccentric. For example, a method for suppressing loosening of the screw has been proposed. However, since the cutter tip is made of cemented carbide, it is difficult to process, and when the cutter tip is attached to the cutter base, the engagement between the stopper and the recess cannot be confirmed. It is difficult to pass the screw through the eccentric hole. Since the shaft is eccentric, a force is required for tightening, which causes a problem such as misunderstanding as if it is firmly tightened.

  Therefore, the present invention provides a cutter table, a chamfering cutter blade, and a chamfering machine that can prevent the cutter chip from being loosened during operation while facilitating the fixing of the cutter chip to the cutter table. For the purpose.

In order to achieve the above object, the present invention provides a chamfering machine by tightening and fixing a plurality of cutter chips each having a multi-surface circumferential surface in which at least one of a plane and a curved surface is connected by three or more surfaces. A chamfering machine having a cutter base for constituting a chamfering cutter blade to be mounted on and used, and the peripheral surface of the cutter tip has an arc-shaped recess that bulges toward the center of the tip body. Are provided at equal intervals in the direction, and the corners on both side edges of the recess are arcuate cutting blades, and a curved surface that bulges outward from the center of the chip body, consists multifaceted that said curved surface bulging toward the center led alternately three sides or more, the cutter block, the cylinder axis shaped shank, base-like provided at the distal end of the shank A chip holder, wherein the chip holder has a plurality of chip pockets having a planar wall surface at equal intervals in the rotation direction about the shank axis and facing the rotation direction side. And a fixing seat for accommodating the cutter tip is recessed in the wall of the tip pocket, and the fixing seat is screwed into the screw to fasten and fix the cutter tip. And a screw hole for forming the cutting blade on the side peripheral surface rising from the peripheral edge of the flat bottom surface of the fixed seat. depending on the indentations provided on the convex portion of the concave Mito corresponding shapes are more projectingly at least two surfaces of indentations provided on the peripheral surface of the cutter tip housed in the fixed seat, uneven A chamfering machine, characterized in that it is configured to the convex portion and the surface on Jo the formed side peripheral surface of the fixing seat contact.

  According to the above configuration, at least two of the peripheral surfaces of the cutter chip accommodated in the fixed seat are configured to come into surface contact with the side peripheral surface of the fixed seat formed in an uneven shape. It is possible to suppress the cutter tip from moving finely inside the fixed seat due to the applied vibration, impact, or the like, and it is possible to suppress the tightening and fixing by the screw from being loosened. Moreover, the side peripheral surface of the fixing seat is formed in an uneven shape and is in surface contact with the peripheral surface of the cutter tip, so that the surface contact state can be easily seen and the cutter tip can be easily fixed to the cutter base.

Further, in the above Symbol onset bright, the cutter tip, the peripheral portion of the chip main body which forms the plate, by providing by arranging a plurality of cutting blades forming the circular arc substantially polygonal shape, the circumferential surface consisting of polyhedral In addition, the one surface and the other surface facing each other across the peripheral surface form a flat surface shape orthogonal to the peripheral surface, so that it is formed into a substantially polygonal plate shape, and is further fastened and fixed to the cutter table. Preferably, the fixing hole through which the screw is inserted is formed so as to penetrate the chip body in the thickness direction between the center of the one surface and the center of the other surface. It is preferable that the one surface side and the other surface side are symmetrical with respect to the center.

  According to the above configuration, since the one surface side and the other surface side are symmetrical with respect to the center in the thickness direction of the chip body, the cutter tip can be used by turning it from the one surface to the other surface. Thus, the number of times the cutter tip is reused can be increased, and the processing efficiency can be improved.

Further, the present invention is a chamfering machine using the above-described chamfering cutter blade, comprising a rotating shaft on which the chamfering cutter blade is mounted, and the rotating shaft is supplied from a high frequency power source. The chamfering machine is configured to be rotationally driven by power feeding.

  According to the above configuration, the cutter blade is rotated at a high speed without decreasing the rotational speed even when a load is applied by using a high-frequency power source, but the cutter tip is not easily loosened even under vibrations or shocks caused by the high-speed rotation. In addition, when replacing the cutter tip due to wear of the cutting blade or the like, the cutter tip can be easily fixed to the cutter base.

  It is possible to provide a cutter table, a cutter blade for chamfering, and a chamfering machine that can prevent the cutter chip from being loosened during operation while facilitating the fixing of the cutter chip to the cutter table.

(A) which shows the cutter chip for R chamfering of an embodiment is a top view, (b) is a longitudinal section, (c) is a transverse section, and (d) shows a cutter chip for C chamfering. , (E) is a longitudinal sectional view. (A) which shows the cutter stand of embodiment is a side view, (b) is a bottom view. (A) which shows the cutter blade of embodiment is a side view, (b) is a bottom view. Sectional drawing which shows the chamfering machine of embodiment. The side view which shows the cutter blade of another form.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Cutter tip]
The cutter tips shown in FIGS. 1A to 1C are R-chamfered cutter tips 10R, and the cutter tips shown in FIGS. 1D to 1E are C-chamfered cutter tips 10C. These cutter tips 10R and 10C are configured by providing a plurality of cutting blades 12 having a linear shape or an arc shape in a substantially polygonal shape at the peripheral portion of a plate-shaped tip body 11.

  The chip body 11 will be described. The chip body 11 is formed of a cemented carbide material, and is formed into a circular plate shape if the cutter chip 10R is for chamfering, and a regular hexagonal plate shape if the cutter chip 10C is for chamfering. It has a surface 13. In the chip body 11, the one surface 11 </ b> R and the other surface 11 </ b> L that are opposed to each other with the peripheral surface 13 interposed therebetween are flat surfaces orthogonal to the peripheral surface 13. A fixing hole 14 is formed in the chip body 11 so as to penetrate the chip body 11 in the thickness direction between the center of the one surface 11R and the center of the other surface 11L.

  The fixing hole 14 is provided to insert a screw for fixing the cutter chips 10R and 10C to a cutter base to be described later. A flat head screw is used for the screw so that the top surface of the screw head is flush with the one surface 11R or the other surface 11L. And in order to accommodate the head part of this countersunk screw, the internal peripheral surface of the both ends of this fixing hole 14 is formed in the taper shape which expands in diameter as it approaches the one surface 11R or the other surface 11L.

On the peripheral surface 13 of the cutter chip 10R for R chamfering, there are six arc-shaped recesses that swell toward the center of the chip body 11 at regular intervals in the circumferential direction, that is, in a substantially regular hexagonal shape. The corners of both side edges of the recess (one side edge is on the one surface 11R side and the other side edge is on the other surface 11L side) are the cutting blades 12 each having an arc shape. The R chamfering cutter tip 10 </ b> R includes a curved surface that bulges outward from the center of the tip body 11, and the tip body 1.
1 has a peripheral surface 13 composed of 12 surfaces alternately connected to the curved surface swelled toward the center of 1.

  In the C chamfering cutter chip 10C, the corners of both side edges (one side edge is on the one surface 11R side and the other side edge is on the other surface 11L side) of each surface of the peripheral surface 13 are linear. The cutting blade 12 is used. The C chamfering cutter chip 10 </ b> C has a peripheral surface 13 composed of six surfaces in which six planes are connected.

  As described above, the cutter chips 10 </ b> R and 10 </ b> C have a flat surface in which the chip body 11 is formed in a circular plate shape or a regular hexagonal plate shape, and one surface 11 </ b> R and the other surface 11 </ b> L of the chip body 11 are orthogonal to the peripheral surface 13. The fixing hole 14 passes through the central portion of the one surface 11R and the central portion of the other surface 11L. Accordingly, the cutter chips 10R and 10C have a symmetric shape with the one surface 11R and the other surface 11L with respect to the center in the thickness direction of the chip body 11 (indicated by a one-dot chain line in the drawing). The surface 11L can be used without distinction between the front and the back. Further, six cutting blades 12 are formed on one surface 11R or the other surface 11L. As a result, when the cutter tips 10R and 10C are replaced due to wear of the cutting blade 12 or the like, the front and back surfaces are changed six times on each side of the one surface 11R or the other surface 11L, so that one cutter can be used a total of 12 times. It can be turned.

[Cutter stand]
As shown in FIGS. 2A and 2B, the cutter base 20 includes a cylindrical shaft-shaped shank 21 and a substantially circular trapezoidal chip holder 22 provided at the tip of the shank 21. Yes. The chip holder 22 is provided with a plurality of (three in this embodiment) chip pockets 23. The chip pocket 23 is formed by cutting out the tip of the chip holder 22 in a fan shape so as to be spaced at regular intervals in the rotation direction T around the axis C of the shank 21 in plan view. A concave shape having a planar wall surface 24 facing the direction T is formed. The number of chip pockets 23 is not limited to three, and two or four or more chip pockets 23 may be provided as long as there are a plurality of chip pockets 23.

  A fixed seat 25 for receiving and holding the cutter chips 10R and 10C is recessed in the wall surface 24 of the chip holder 22. A screw hole 26 is formed on the flat bottom surface 25 </ b> A constituting the main part of the fixed seat 25. Further, a side peripheral surface 25B is formed upright from the peripheral edge of the flat bottom surface 25A of the fixed seat 25, and the side peripheral surface 25B rising from the flat bottom surface 25A is a peripheral surface of the cutter chips 10R and 10C. It is formed in an uneven shape corresponding to the shape. That is, the side peripheral surface 25B has a shape corresponding to the peripheral surface 13 of the chip body 11 that is substantially circular plate-like. Specifically, a plurality of convex portions 27 corresponding to the recesses are formed on the side peripheral surface 25B in accordance with the recesses provided on the peripheral surface 13 of the chip body 11 to form the cutting blade 12. (In FIG. 2, there are three convex portions 27 corresponding to the peripheral surface of the cutter tip 10R).

In the present embodiment, as described above, the cutter tips 10R and 10C are configured to be used on the one surface 11R and the other surface 11L without distinction between the front and the back. For this reason, the angle of the cutting edge of the cutting blade 12 is 90 °, which is an angle formed by the one surface 11R or the other surface 11L and the peripheral surface 13. When the cutting blade 12 is configured as described above, the cutter tips 10R and 10 fixed to the fixed seat 25 are arranged with respect to the axis C of the shank 21 so that the contact angle of the cutting blade 12 to the chamfering object is suitable. It is attached in a state where it is tilted forward in the rotational direction T side by a predetermined angle θ from the extending direction (indicated by a chain line in FIG. 2A). The predetermined angle θ is preferably 5 ° to 45 °, more preferably, from the viewpoint of making the processing efficiency such as the balance between the chamfering amount by the cutting blade 12 and the wear amount of the cutting blade 12 suitable. It is 5 ° to 30 °, and more preferably 10 ° ± 5 °. In addition, the predetermined angle θ when the cutter chips 10R, 10 are attached at an angle is adjusted by setting the formation angle of the wall surface 24 or the flat bottom surface 25A of the fixed seat 25 when the chip pocket 23 is formed.

[Cutter blade]
Hereinafter, it demonstrates as what uses the cutter chip 10R for R chamfering among the said cutter chips 10R and 10C.

  As shown in FIGS. 3A and 3B, the cutter blade 30 is configured by mounting the cutter tip 10 </ b> R on the cutter base 20. Here, the cutter tip 10R is attached to the cutter base 20 by inserting a shaft portion of a screw (not shown) into the fixing hole 14 provided in the tip body 11, and then screwing the screw into the screw hole 26. It is done by entering and tightening.

  The fixed seat 25 is formed so that its depth is shallower than the thickness of the cutter tip 10R. Further, the fixed seat 25 is formed so that the area of the flat bottom surface 25A is smaller than the area of the one surface 11R or the other surface 11L of the cutter tip 10R. Therefore, the cutter tip 10R mounted on the fixed seat 25 causes the cutting blade 12 to be exposed to the outside of the tip pocket 23, and causes the wall surface 24 or the like to contact the target when the cutter blade 30 rotates in the rotation direction T. Instead, the object is arranged to be cut by the cutting blade 12.

  In the fixed seat 25, the side peripheral surface 25 </ b> B made of a concavo-convex surface coincides with the concavo-convex surface made up of five of the 12 peripheral surfaces 13 of the cutter chip 10 </ b> R mounted on the cutter base 20. The uneven surface of the cutter tip 10R is brought into surface contact with the side peripheral surface 25B of the fixed seat 25. As a result, the cutter tip 10R is fixed to the inside of the fixed seat 25, and the cutter tip 10R is restrained from moving finely inside the fixed seat 25 due to the surface contact between the concave and convex surfaces. It is possible to suppress the tightening and fixing of the cutter tip 10 </ b> R by screws due to applied vibration or impact.

[Chamfering machine]
As shown in FIG. 4, the chamfering machine 50 includes a cutter fixing bolt in which the cutter blade 30 is provided at the lower end of a rotary shaft 52 that is rotatably inserted vertically inside a head portion 51 and a guide bearing 53 is provided. 54, a rotary mount 55 having a shaft insertion hole penetrating in the center is screwed into the lower end of the head portion 51, and a through hole is penetrating in the lower part of the rotary mount 55. A disc-shaped support guide plate 56 is configured to be rotatably installed with a bearing 57 interposed therebetween.

In the chamfering machine 50, it is preferable to use a high-frequency power source as a drive source for rotating the rotary shaft 52. Then, by rotating the rotary shaft 52 by feeding power from the high frequency power source, the cutter blade 30 can be rotated at high speed without reducing the rotational speed even when a load is applied to the cutter blade 30. Further, in the cutter blade 30, since the loosening of the clamping and fixing of the cutter tip 10R is suppressed as described above, the cutting operation can be suitably performed.
It should be noted that the internal structure of the chamfering machine 50 is not limited to the structure shown in FIG. For example, the cutter blade 30 may be configured to be directly connected to a motor.

[Example of change]
When the C chamfering cutter tip 10C is used, the cutter blade 30 has a configuration as shown in FIG. 5, for example. That is, the side peripheral surface 25B of the fixed seat 25 is formed into an uneven surface by projecting two convex portions 27 on the side peripheral surface 25B in accordance with the hexagonal peripheral surface 13 of the cutter tip 10C. ing. The concavo-convex surface coincides with the concavo-convex surface formed of two of the six peripheral surfaces 13 of the cutter chip 10C. The uneven surface of the cutter chip 10 </ b> C is brought into surface contact with the uneven surface of the fixed seat 25.

  In the cutter chips 10R and 10C, the cutting blade 12 is formed at 90 °, which is an angle formed by the one surface 11R or the other surface 11L and the peripheral surface 13, but the present invention is not limited thereto. An angle of less than 90 °, such as 30 °, 45 °, or 60 °, may be provided by providing a recess such as a V-shaped groove or a U-shaped groove in the center in the thickness direction.

  The chip body is not limited to the above-mentioned shape, for example, a regular triangular plate shape such as a regular triangular plate shape, a regular square plate shape, a regular pentagonal plate shape, a regular heptagonal plate shape, a regular octagonal plate shape, or a right triangle. It may be a plate shape, an isosceles triangle plate shape, a rhomboid plate shape, a polygonal plate shape such as a parallelogram plate shape, or the like. Thus, even when the chip body has a regular polygonal plate shape or a polygonal plate shape, if it is for R chamfering, the central portion of each surface is recessed in an arc shape on the peripheral surface as described above. Or, if it is for chamfering, it can be used as a chamfering cutter tip by leaving each surface as it is on the peripheral surface.

10R, 10C Cutter tip 11 Tip body 12 Cutting blade 13 Peripheral surface 14 Fixed hole 20 Cutter base 21 Shank 22 Chip holder 23 Chip pocket 24 Wall surface 25 Fixed seat 25A Flat bottom surface 25B Side peripheral surface 26 Screw hole 27 Convex portion 30 Cutter blade 50 Chamfering machine 52 Rotating shaft

Claims (3)

A cutter blade for chamfering that is mounted and used on a chamfering machine is constructed by tightening and fixing a plurality of cutter chips having a multi-surface peripheral surface where at least one of a plane and a curved surface is connected by three or more surfaces. A chamfering machine having a cutter base for carrying out,
The peripheral surface of the cutter tip is
Indentations having an arc shape that bulges toward the center of the chip body are provided at equal intervals in the circumferential direction, and corners on both side edges of the indentations are respectively arc cutting blades, and The curved surface that bulges outward from the center of the chip body and the curved surface that bulges toward the center of the chip body are composed of multiple surfaces alternately connected to each other.
The cutter table includes a cylindrical shaft-shaped shank and a table-shaped chip holder provided at the tip of the shank.
In the chip holder, a plurality of chip pockets are formed in a concave shape having a planar wall surface at equal intervals in the rotation direction around the axis of the shank and facing the rotation direction side, and the chip The wall surface of the pocket is recessed with a fixing seat that accommodates the cutter tip inside,
The fixed seat has a screw hole on the flat bottom surface of the fixed seat for screwing the screw to fasten and fix the cutter tip, and a side periphery rising from the peripheral edge of the flat bottom surface of the fixed seat. On the surface , in accordance with a recess provided on the peripheral surface of the chip body to form the cutting blade, a plurality of convex portions corresponding to the recess are provided.
At least two surfaces of the recess provided on the peripheral surface of the cutter chip accommodated in the fixed seat are configured to come into surface contact with the respective convex portions on the side peripheral surface of the fixed seat formed in an uneven shape. Chamfering machine characterized by that. The cutter tip is provided with a plurality of arcuate cutting blades arranged in a substantially polygonal shape at the periphery of a plate-like tip body, and has a multi-faceted circumferential surface and sandwiches the circumferential surface. Are formed in a substantially polygonal plate shape by forming a flat surface perpendicular to the peripheral surface, and the screw is inserted to be fastened and fixed to the cutter base. The fixing hole is formed so as to penetrate the chip body in the thickness direction between the center of the one surface and the center of the other surface, so that the one surface is based on the center in the thickness direction of the chip body. The side and the other surface side are symmetrical.
The chamfering machine according to claim 1 . The chamfering cutter blade has a rotating shaft attached to an end, and the rotating shaft is configured to be driven to rotate by feeding from a high-frequency power source.
The chamfering machine according to claim 1 or 2 .

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